Sorry for the lateness, I was kinda busy today, so let's put our hands on this case:
I already went east as far as I could (Which I guess it's like going back to the rooms where I was with Titania at the begining), then tried to went south, and found nothing... nothing suspicious, nothing with a weird body chewing on something, nothing weird that I could interact with... nope, nothing. Just a bunch of machines with no use whatsoever and the meteor goons that I fought earlier. I guess that i am either blind because I can't find anything... or this is just too dificult for me for no reason, so yeah, i couldn't make any progress since my first post...
Really? Hmm i haven't found anything yet to do something like that... I may be wrong, so im gonna ask, do I have to enter the G.U.M room in order to do that?
Probably... I'll try to do that then, and im gonna check on everything to see if I missed something or did something wrong on my past save file, so I'll avoid ending up like my past save file (hopefully).
K, I find out the problem.
I think I probably went out of the room looking for the key Taka said, and when I came back, it was filled as Phoenix said and I didn't realized, so that's why I couldn't progress.
So... I guess the case is closed haha, so sorry for the bother guys, and many many thanks to everyone here for the help you guys gave me. I guess I'll leave deep plate full of cookies as a reward... and some points of course
Moral of the story: Don't enter that room unless you got that key first, otherwise when you come back you'll get stuck like me in the first post. I think this can be fixed when the main link is up, so yeah... If anyone can inform Ame about this, that would be cool (unless it's already informed, which is cool too btw).